#include <iostream>
using namespace std;

int main(int argc, char const *argv[])
{
    int a, b, c, d;
    cin >> a >> b >> c >> d;

    if(a<b && b<c && c<d)
        cout << "Fish Rising" << endl;

    else if(a>b && b>c && c>d)
        cout << "Fish Diving" << endl;

    else if(a==b && b==c && c==d)
        cout << "Fish At Constant Depth" << endl;

    else
        cout << "No Fish" << endl;

    return 0;
}
